Stencil printing apparatus



STENCIL PRINTING APPARATUS.

- Specification of Letters Patent.

. Patented Dec. 6, 1921.

Application filed March 3, 1921. Serial No, 449,566.`

To all whom t may consom: f

Be it known that I, HARRY S. TREBiTsoH, a citizen of Hungary, and resident of the city of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Stencil Printing Apparatus, of which the following is a specification. e

The present invention relates to stencil printing devices for reproducing or making manifold copies of letters, circulars, music, etc., and has for its main object to provide a device of this type which is simple in construction, efficient in operation, durable in use, and which is capable ofV manufacture on a commercial scale, or, in other words one which is not so difficult to make as to be beyond the reasonable cost of such a device With these and other objects in view, which will more fully appear as the nature of the invention is better understood, the same consists in the combination, arrangement and construction of parts hereinafter described, pointed out in the appended claim and illustrated in the accompanying drawings, it being understood that many changes may be made in the size and proportion of the several parts and details of construction within the scope of the appended claim, without departing from the spirit or sacril'icing any of the advantages of the invention.

One of the many possible embodiments of the invention is illustrated in the accompanying drawings, in which Figure 1 is a plan view of a stencilprinting apparatus constructed in accordance with the present invention; Fig. 2 is a section taken on line 2-2 of Fig. 1; Fig. 3 is a side elevation thereof; and Fig. 4 is a plan view of a stencil sheet, from which the copies are to be made.

In the drawings, the numeral 10 indicates a tray of any suitable material and conguration, to fit the sheets on which the impressions are to be made. In the case illustrated in the drawings the tray is of oblong' configuration and is provided upon one of its end walls with a plurality, preferably two, headed studs 11, which are spaced apart and disposed outside of the tray. The studs are located adjacent the upper edge of the said end wall in a horizontal plane, for a purpose hereinafter to be described. Within the tray is located a printing bed 12, in the form of an ink-pad, the exposed face of which is flush with kthe open top of the tray. The pad may be permanently fixed within the tray or itmay be removable therefrom, it being made of an absorbent material, that is saturated from time to time with ink.

The Vmatter to be printed is provided in the usual manner upon a wax stencil sheet 13, fastened to a cardboard strip 14, the latter being provided with perforations 15, through which the studs 11 may be extended. The stencil sheet is pasted to the strip 14 approximately throughout half of the width of thel'atter, say for instance between the edge 14 of the strip to the dotted line 14, (F ig. 4). When, therefore, the perforations 15 of the, said strip are engaged with the studs 11 and the stencilsheet placed on the pad 12, the said `strip extends in parallel relation to the studded end wall of the tray and projects above the tray, thus forming a gage, against which one edge of the sheet, on

which an impression is to be made, may be placed.

In order to hold the free edge of the stencilv sheet against movement on the printing bed, there is provided a suitable clamping device, for instance a bar 16, that is hinged at 17 to one of the sides of the tray, said bar being held transversely of the tray in clamping position by a hook 18, pivoted at 19 to the opposite side of the tray.

r1`he operation of this device is as follows: The stencil having been properly prepared, its strip 14 is engaged with the studs 11 and the sheet placed throughout its area into contact with the pad 12, after which the bar 16 is swung onto the sheet and Jghe hook 18 engaged with the said bar. In this manner the stencil is held over the printing bed. The copying is then effected yby placing the sheet on which the impression is to be made on top of the stencil sheet and pressing it firmly by a suitable tool, for instance a printing roller. The pressure forces theJ ink through the perforations, incisions, etc., in the stencil. sheet onto the copy sheet. As mentioned above, the strip 14 serves as a gage, against which one of the edges of the copy sheet is placed in the printing operation.

It is obvious that, while herein a specific stencil sheet clamping mechanism has been described, others may just as well be used without departing from the invention, which lies mainly in the provision of an ink-pad containing tray, in combination with a mechanism for holding the stencil` sheet in posiperforations` studs on said tray extending 10 tion on said pad. p through said erforations, and means on What I claim is i saidltrayfor ho 'ding the opposite transverse A stencil-printing apparatus comprising a ed e of said sheet in position upon said bed.

5 tray, an ink eontainingprintng bed' therein, igned at New York, in the county of New the exposed face of said bed being flush with i ork and State of New York, this 17 th day 15 the open top of said tray, a stencil sheet on of February, A. D. 1921. Y top of said bed, a gage secured to one of the n Y p l transverse edges of said stencil sheet having Y v HARRY S. TREBITSCH. 

